Fix link to source of reference docs

Author: rstoyanchev

README.md

@@ -8,10 +8,9 @@ This project is governed by the [Spring Code of Conduct](CODE_OF_CONDUCT.adoc).
 
 ## Documentation
 
-This project maintains its reference documentation ([published](https://docs.spring.io/spring-graphql/docs/current-SNAPSHOT/reference/html/) and [source](docs/src/docs/asciidoc)) and an
+This project maintains its reference documentation ([published](https://docs.spring.io/spring-graphql/docs/current-SNAPSHOT/reference/html/) and [source](spring-graphql-docs/src/docs/asciidoc)) and an
 [API reference](https://docs.spring.io/spring-graphql/docs/current-SNAPSHOT/api/).
 
-
 ## Continuous Integration Builds
 
 Information regarding CI builds can be found in the [Spring GraphQL Concourse pipeline](ci/README.adoc) documentation.